Arborviral infx w/ rituximab? 21 RTX pts dx w/ arboviral neuroinvasive Dz, (encephalitis, acute flaccid myelitis); 79% died. B cell depletion impairs immunity & spread of West Nile Virus, serologic Ab Dx tests; thus if suspected, order RT-PCR tests https://t.co/yQiXI2IYqd https://t.co/dZX2CQJs0L